US taxpayers with LLC structures can be exposed to significant tax risks, including effective rates of up to 75%. With HMRC now consulting on potential changes, understanding the evolving treatment of US LLCs is critical. Our specialists help you navigate complexity, reduce exposure and ensure compliant cross-border tax outcomes.
US LLC structures and UK tax: What advisers and taxpayers need to know
Anyone who works with US taxpayers knows the challenges associated with US LLC structures. It has long been HMRC’s opinion that these structures are the equivalent of companies, regardless of how they are treated in the US. This rigid view has often led to LLC members being subject to tax rates of up to 75%.
Whilst there was a minor victory for the taxpayer through the Anson case, HMRC were quick to clarify that each situation would be looked at on its own merits and published extensive guidance to explain their disagreement with the outcome of the case.
However, it looks like there may be a softening to HMRC’s approach, as they have recently launched a consultation on the taxation of members of LLCs and other ‘reverse hybrids’, that is, structures treated as tax-transparent overseas but as corporate bodies in the UK.
This consultation acknowledges the potential for excessive tax rates on LLC profits and even asks whether there are any other jurisdictions that offer more favourable treatment. This kind of thinking is very welcome and shows that the government accept that the best way to attract and retain overseas wealth is by offering a tax regime that is fair and simple (which is evidently not the case for LLCs).
Why US LLCs create UK tax challenges
The key issue lies in the mismatch of tax treatment between the US and the UK.
In the US, LLCs are commonly treated as transparent, meaning profits are taxed directly on the members. In contrast, HMRC often regards the same entity as a separate corporate body. This difference in classification creates what is known as a reverse hybrid mismatch.
In practice, this can mean that income is taxed differently across jurisdictions, leading to double taxation. While the UK–US Double Taxation Agreement is intended to provide relief, it does not always operate effectively where the two systems fundamentally disagree on how the entity should be treated.
For UK-based advisers and those working with US-connected individuals, this creates significant advisory and compliance risk.
HMRC Consultation: A potential shift in approach
HMRC has recently launched a consultation into the treatment of LLCs and other reverse hybrid entities, acknowledging the unintended tax consequences of the current regime, and it raises the question of whether a more aligned approach could be adopted.
Importantly, this signals a broader policy consideration: that the UK tax system must remain fair, competitive and administratively workable, particularly in the context of increasing global mobility.
What changes could be introduced?
- Aligning UK and US tax treatment
The most prominent proposal under consultation is to align the UK tax treatment of LLCs with their treatment in the US.
This approach would allow members of specific reverse hybrid structures to treat them as transparent in the UK, thus meaning the taxpayer is taxable on the underlying profits in both jurisdictions and therefore credits can be claimed as per the relevant Double Taxation Agreement (DTA). This treatment would be dependent on the entities not being resident in the UK or trading via a permanent establishment. The taxpayer would automatically receive the matching transparent treatment.
However, if the entity loses its tax transparent treatment overseas (for example, if a ‘check-the-box’ election was made in the US), then it would cease to be treated as transparent in the UK.
While this is arguably the most straightforward solution, there are important technical considerations. Questions remain around how the rules would interact with existing regimes, including the FIG regime, how territorial scope rules under ITTOIA 2005 would apply, and how tax credits would be handled in specific scenarios such as interest income.
Despite the practical questions this is likely to be HMRC’s favoured route as it similar to how they have managed other mismatched with US taxation, for example on carried interest.
- Alternative tax credit approaches
An alternative option being considered is to introduce mechanisms allowing tax paid overseas to be relieved either by credit or deduction in the UK.
This approach is less developed in the consultation, which suggests this is a more unlikely route. However, there is merit in this approach, which could be similar to the approach taken with trusts. Presumably, a form of ‘tax pool’ would be created which is matched to distributions made from the entity. Also, matters such as delays in the tax points (i.e., US tax on profits held in LLC compared to UK tax on distributions), corporate residence and how the foreign tax rate is calculated need to be considered.
Why this matters now
With a growing number of US nationals relocating to the UK, the taxation of LLCs is becoming an increasingly important issue.
Without careful planning, LLC arrangements can result in:
- unexpectedly high tax liabilities
- inefficient tax outcomes
- increased exposure to HMRC scrutiny.
At the same time, the lack of clarity in HMRC’s approach creates uncertainty for both taxpayers and their advisers, making it difficult to provide clear and confident guidance.
Encouragingly, the current consultation suggests that HMRC recognises these challenges and is open to reform.
What should you do next?
While reforms are still under consideration, there are steps you can take now.
Reviewing existing LLC structures in light of current HMRC guidance is a key first step. This includes understanding how income is being taxed in both jurisdictions and identifying any exposure to double taxation.
From there, consideration should be given to whether those structures remain appropriate, particularly in light of potential future changes.
Early action can help prevent costly corrections and ensure your clients remain compliant.
How we can support you
For more information, contact Partner and Head of Private Client Tax, Stephen Kenny or Private Client Director, Adam Jefferies.
